A circular mechanism with center positioning

Abstract

A center-positioning rounding mechanism includes a worktable, multiple rounding assemblies, a lifting assembly, and a center-positioning assembly. Each rounding assembly includes a drive motor, a connecting block, and a push block. A pressure sensor is located between the connecting block and the push block. The center-positioning assembly includes a drive cylinder, a connecting rod, a pressure rod, an expansion core, and an expansion sleeve. The pressure sensor has two pressure setpoints. When one pressure setpoint is reached, the drive cylinder starts to drive, expanding the expansion sleeve. When the other pressure setpoint is reached, the drive motor stops driving and maintains the position of the push block. The center-positioning rounding mechanism pushes and compresses multiple stators through the rounding assemblies, ensuring close cooperation between them to complete the rounding operation. The center-positioning rounding mechanism requires no manual intervention throughout the process, has a high degree of automation, and is suitable for assembly line production.

Description

Technical Field

[0001] This invention relates to the field of motor coil assembly technology, and in particular to a rounding mechanism with center positioning. Background Technology

[0002] Stator windings refer to the windings installed on the stator. These windings are assembled from multiple stators into a single unit, requiring rounding and welding. Therefore, specialized tooling equipment is needed for rounding. For example, Chinese patent CN202220796701.0 discloses a high-precision rounding mechanism for motor coils, which includes a machine base, a translation mechanism, a rounding mechanism, and a welding mechanism. The rounding mechanism includes a rounding mold, push blocks, first cylinders, a lower mold core assembly, and an upper mold core assembly. Multiple first cylinders are located circumferentially outside the rounding mold, and their output ends are connected to the push blocks. Multiple push blocks respectively press and squeeze the stators, thereby eliminating gaps between the stators. The lower mold core assembly includes a vertical drive device and a mold core. The mold core has a circular iron core at its center facing the rounding mold, and a limiting ring circumferentially surrounding the mold core. After the stator completes the rounding process, the coil detaches from the rounding mold under the action of the upper and lower mold core assemblies. External grippers then place the coil into the welding mechanism, which welds the connections between multiple stators, thus solidifying the coil. Traditional stator rounding processes primarily rely on external clamping mechanisms. Specifically, multiple circumferentially arranged grippers or pushers simultaneously apply radial thrust from the outer circumference of the stator, pressing each stator lamination together to achieve rounding and positioning, followed by welding. However, this purely external radial clamping technique lacks internal reference, resulting in limited rounding accuracy. Because the entire stator assembly is hollow, without any support or positioning reference, it is only squeezed from the outside in. Each stator lamination moves around an unstable center under external thrust, making it difficult to ensure strict alignment of all stator lamination axes. This easily leads to ellipticity or eccentricity in the rounded stator, making it difficult to achieve high standards of roundness accuracy. Summary of the Invention

[0003] In view of this, the present invention provides a circular mechanism with central positioning to solve the above problems.

[0004] A center-positioning rounding mechanism is disclosed for precisely joining several stators that have undergone rough splicing. Each stator has a groove on its outer circumferential wall and a stepped portion at each end. The center-positioning rounding mechanism includes a worktable, multiple rounding assemblies mounted on the worktable, a lifting assembly on one side of the worktable, and a center-positioning assembly mounted on the lifting assembly. Each rounding assembly includes a drive motor, a lead screw at the output end of the drive motor, a nut slider screwed to the lead screw, a connecting block fixedly mounted on the nut slider, a push block on the side of the connecting block away from the nut slider, and a guide rail on one side of the connecting block and the push block. A pressure sensor is located between the connecting block and the push block, and the two are fixedly connected by the pressure sensor. The center positioning component includes a drive cylinder, a connecting rod disposed at the output end of the drive cylinder, a pressure rod fixedly disposed on the connecting rod, an expansion core sleeved on the pressure rod, and an expansion sleeve movably disposed on the expansion core. One end of the expansion core has a first inner conical surface, and the other end has a second inner conical surface. The circumferential outer wall of the expansion sleeve, located at its midpoint, has a first outer conical surface, and the end of the expansion sleeve away from the lifting component has a second outer conical surface. The first inner conical surface matches the first outer conical surface, and the second inner conical surface matches the second outer conical surface. Further, the length direction of the guide rail is the same as the length direction of the lead screw, and it faces the center of the worktable. Both the connecting block and the push block are slidably disposed on the guide rail.

[0005] Furthermore, the length direction of the guide rail is the same as the length direction of the lead screw, and it faces the center of the worktable. Both the connecting block and the push block are slidably mounted on the guide rail.

[0006] Furthermore, a circular block is fixedly provided at one end of the push block away from the connecting block, and a positioning strip is provided at the end of the circular block away from the push block, which matches the groove on the stator.

[0007] Furthermore, the lifting assembly includes a lead screw lifting device, a lifting frame disposed at the output end of the lead screw lifting device, a connecting cylinder fixedly disposed on the lifting frame, a base fixedly disposed on the connecting cylinder, and a positioning seat fixedly disposed on the base.

[0008] Furthermore, the lifting frame includes a first lifting plate disposed at the output end of the lead screw lifting device, at least four connecting columns fixedly disposed on the first lifting plate, and a second lifting plate fixedly disposed at the end of the four connecting columns away from the first lifting plate.

[0009] Furthermore, the positioning seat is cylindrical in shape, and a number of placement platforms are provided on the side of the positioning seat away from the base. The multiple placement platforms are arranged in a circle, and their positions facing the axis of the positioning seat are arc-shaped plate structures. The step portion is engaged at the end of the placement platform.

[0010] Furthermore, a welding groove is provided at the end of the shelf, and there is a gap between two adjacent shelves.

[0011] Furthermore, the end of the pressure bar away from the connecting rod has a pressure plate.

[0012] Furthermore, the expansion sleeve protrudes from the plane of the positioning seat where the platform is located, and there is an annular hollow portion between the positioning seat and the expansion core.

[0013] Compared with existing technologies, the circularization mechanism with center positioning provided by this invention pushes and compresses multiple stators through the circularization assembly, making them closely fit together to complete the circularization operation. The pressure plate presses down on the expansion sleeve to expand it, so that the outer circumferential wall of the expansion sleeve fits tightly with the inner circumferential wall of the multiple stators, thereby positioning the center of the stators and making the axes of the multiple stators coincide, thus improving the roundness of the multiple stators after circularization. Furthermore, the welding operation is carried out with the inner and outer walls of the multiple stators being pressed, which improves the stability of the welding operation and further improves the roundness of the multiple stators after welding and fixing. The circularization mechanism with center positioning requires no manual intervention throughout the process, has a high degree of automation, and is suitable for assembly line production operations. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the circular mechanism with central positioning provided by the present invention.

[0015] Figure 2 for Figure 1 A schematic diagram of the structure of multiple stators that are coarsely assembled by a circular mechanism with central positioning.

[0016] Figure 3 for Figure 1 A cross-sectional schematic diagram of the circular component of a circular mechanism with central positioning.

[0017] Figure 4 for Figure 1A schematic diagram of the circular block structure of a circular mechanism with central positioning.

[0018] Figure 5 for Figure 1 A schematic diagram of the lifting component and the center positioning component of a circular mechanism with center positioning.

[0019] Figure 6 for Figure 1 A schematic diagram of the positioning seat of a circular mechanism with central positioning.

[0020] Figure 7 for Figure 5 Enlarged diagram of point A in the middle.

[0021] Reference numerals: Workbench 10, Rounding assembly 20, Drive motor 21, Lead screw 22, Nut slider 23, Connecting block 24, Push block 25, Guide rail 26, Pressure sensor 27, Rounding block 28, Positioning strip 29, Lifting assembly 30, Lead screw lifting device 31, Lifting frame 32, First lifting plate 321, Connecting column 322, Second lifting plate 323, Connecting cylinder 33, Base 34, Positioning seat 35, Placement platform 351, Welding groove 352, Gap 353, Center positioning assembly 40, Drive cylinder 41, Connecting rod 42, Pressure rod 43, Expansion core 44, First inner conical surface 441, Second inner conical surface 442, Expansion sleeve 45, First outer conical surface 451, Second outer conical surface 452, Pressure plate 46, Hollow part 47, Stator 50, Groove 51, Step part 52. Detailed Implementation

[0022] The following provides a more detailed description of specific embodiments of the present invention. It should be understood that the description of the embodiments of the present invention herein is not intended to limit the scope of protection of the present invention.

[0023] like Figure 1 The diagram shows a schematic representation of the circular assembly mechanism with central positioning provided by the present invention. The circular assembly mechanism with central positioning includes a worktable 10, multiple circular assembly components 20 disposed on the worktable 10, a lifting component 30 disposed on one side of the worktable 10, and a central positioning component 40 disposed on the lifting component 30. It is conceivable that the circular assembly mechanism with central positioning also includes other functional modules, such as a power module, a robotic arm for gripping the stator, and a welding gun for welding, etc., which are technologies known to those skilled in the art and will not be described in detail here.

[0024] Please refer to the following: Figures 2 to 7It should be noted that the centrally positioned circular mechanism is used to precisely splice several roughly assembled stators 50, and to weld and fix two adjacent stators 50 together using a welding gun. The outer circumferential wall of each stator 50 has a groove 51 that matches the lifting assembly 30 to provide positioning for the stator 50. Each end of the stator 50 has a stepped portion 52 that matches the lifting assembly 30, allowing the roughly assembled stators 50 to be mounted on the lifting assembly 30. The matching of the groove 51 and the stepped portion 52 with the lifting assembly 30 will be explained below.

[0025] The workbench 10 is used to support the various components so that they can cooperate in various ways to complete the precise splicing of the multiple stators 50.

[0026] Multiple circular components 20 are arranged circumferentially on the worktable 10, with their output directions all pointing towards the center of the worktable 10. Each circular component 20 includes a drive motor 21, a lead screw 22 disposed at the output end of the drive motor 21, a nut slider 23 screwed onto the lead screw 22, a connecting block 24 fixedly disposed on the nut slider 23, a push block 25 disposed on the side of the connecting block 24 away from the nut slider 23, and a guide rail 26 disposed on one side of the connecting block 24 and the push block 25.

[0027] The drive motor 21 can drive the lead screw 22 to rotate, thereby causing the nut slider 23 to move along the length direction of the lead screw 22.

[0028] A pressure sensor 27 is provided between the connecting block 24 and the push block 25, and the two are fixedly connected together by the pressure sensor 27. The pressure sensor 27 is a device or apparatus that can sense pressure signals and convert them into usable output electrical signals according to a certain rule. It has a flexible structure to improve the mechanical adaptability of the circular assembly 20 and avoid hard contact between the workpiece and the parts. The pressure sensor 27 is provided with two pressure set values. When one pressure set value S1 is reached, the drive cylinder 41 starts to drive to expand the expansion sleeve 45. When the other pressure set value S2 is reached, the drive motor 21 stops driving and maintains the position of the push block 25. The pressure sensor 27 itself is prior art, and its specific structure and working principle will not be described in detail here.

[0029] The length direction of the guide rail 26 is the same as that of the lead screw 22, and it faces the center of the worktable 10. The connecting block 24 and the push block 25 are both slidably disposed on the guide rail 26. Thus, under the drive of the drive motor 21, the push block 25 can reciprocate along the length direction of the guide rail 26 to push and squeeze the stator 50 to complete the rounding operation.

[0030] A circular block 28 is fixedly disposed at one end of the push block 25 away from the connecting block 24. A positioning strip 29 protrudes from the end of the circular block 28 away from the push block 25. The positioning strip 29 matches the groove 51 on the stator 50 to position and precisely push the stator 50. It is conceivable that when the robotic arm grasps multiple stators 50 after rough assembly, it performs the positioning function of the stator 50. After the stator 50 is placed on the lifting assembly 30, the groove 51 on the stator 50 corresponds to the positioning strip 29 on the circular block 28.

[0031] Multiple circular components 20 push and press multiple stators 50, making them fit together tightly to complete the circular operation. After the welding operation is completed, the multiple stators 50 are fixedly connected to each other, completing the precision assembly.

[0032] The lifting assembly 30 includes a lead screw lifting device 31, a lifting frame 32 disposed at the output end of the lead screw lifting device 31, a connecting cylinder 33 fixedly disposed on the lifting frame 32, a base 34 fixedly disposed on the connecting cylinder 33, and a positioning seat 35 fixedly disposed on the base 34.

[0033] The lead screw lifting device 31 can accurately control and adjust the lifting height of the lifting frame 32 according to the program. The internal structure and working principle of the lead screw lifting device 31 are existing technologies and will not be described in detail here.

[0034] The lifting frame 32 includes a first lifting plate 321 disposed at the output end of the lead screw lifting device 31, at least four connecting columns 322 fixedly disposed on the first lifting plate 321, and a second lifting plate 323 fixedly disposed at the end of the four connecting columns 322 away from the first lifting plate 321. Since the first lifting plate 321 and the second lifting plate 323 are fixedly connected by the connecting columns 322, the lead screw lifting device 31 can drive and move the first and second lifting plates 321 and 323 synchronously.

[0035] The connecting cylinder 33 is fixedly disposed on the side of the second lifting plate 323 away from the connecting column 322, the base 34 is fixedly disposed on the side of the connecting cylinder 33 away from the second lifting plate 323, and the positioning seat 35 is fixedly disposed on the side of the base 34 away from the connecting cylinder 33.

[0036] The positioning seat 35 is cylindrical in shape, and a plurality of platforms 351 are provided at intervals on the side of the positioning seat 35 away from the base 34. The platforms 351 are arranged circumferentially, and their positions facing the axis of the positioning seat 35 are arc-shaped plates. After the stators 50 are placed on the platforms 351, the stepped portion 52 engages at the end of the platform 351, thereby supporting the stators 50. A welding groove 352 is provided at the end of each platform 351 to avoid the welding torch during welding operations. A gap 353 is provided between any two adjacent platforms 351, which is used to avoid the pusher block 34 when the circular assembly 20 pushes the stator.

[0037] The center positioning component 40 includes a drive cylinder 41, a connecting rod 42 disposed at the output end of the drive cylinder 41, a pressure rod 43 fixedly disposed on the connecting rod 42, an expansion core 44 sleeved on the pressure rod 43, and an expansion sleeve 45 movably sleeved on the expansion core 44.

[0038] The drive cylinder 41 is fixedly disposed on the side of the first lifting plate 321 facing the second lifting plate 323, and the output direction of the drive cylinder 41 is towards the second lifting plate 323. The connecting rod 42 is movably disposed through the second lifting plate 323, the connecting cylinder 33, and the base 34. The pressure rod 43 is fixedly disposed at the end of the connecting rod 42 away from the drive cylinder 41, and the drive cylinder 41 can drive and move the pressure rod 43 to perform lifting operations.

[0039] The end of the pressure rod 43 away from the connecting rod 42 has a pressure plate 46, which can press the expansion sleeve 45 during the descent of the pressure rod 43.

[0040] The expansion core 44 is fixedly mounted on the base 34, and the expansion core 44 and the pressure rod 43 can move relative to each other.

[0041] The expansion core 44 has a first inner conical surface 441 at one end facing the base 34, and a second inner conical surface 442 at the other end away from the base 34. The expansion sleeve 45 has a first outer conical surface 451 on its circumferential outer wall, located in its middle section, and a second outer conical surface 452 at the other end away from the base 34. The first inner conical surface 441 and the first outer conical surface 451 have the same taper and inclination direction, and the second inner conical surface 442 and the second outer conical surface 452 have the same taper and inclination direction. Thus, the initial state of the expansion sleeve 45 is supported by the first and second outer conical surfaces 451 and 452. Simultaneously, the upper and lower conical surfaces provide two precise guide and support points for the expansion sleeve. When the pressure plate 46 presses down, the two pairs of conical surfaces work simultaneously, generating symmetrical and balanced expansion forces, ensuring that the entire outer wall of the expansion sleeve 45 can expand outwards uniformly.

[0042] The expansion sleeve 45 protrudes from the plane of the positioning seat 35 where the platform 351 is located, and there is an annular hollow portion 47 between the positioning seat 35 and the expansion core 44. When multiple stators 50 are placed on the platform 351, the circumferential inner sidewalls of multiple stators 50 are in gap contact with the expansion sleeve 45, and the wire ends scattered on the stators 50 are placed in the hollow portion 47, thereby avoiding the influence of wire ends on the rounding operation and welding operation.

[0043] When the pressure plate 46 presses down on the expansion sleeve 45, since the expansion core 44 is fixed, relative movement occurs between the first inner conical surface 441 and the first outer conical surface 451, and between the second inner conical surface 442 and the second outer conical surface 452. Due to the guiding effect of the conical surfaces, these two pairs of conical surfaces effectively convert the axial force applied by the pressure plate 46 into a radial force that forces the expansion sleeve 45 to produce radial elastic expansion, thereby expanding the expansion sleeve 45. After expansion, the outer wall of the expansion sleeve 45 contacts the inner wall of all the surrounding stators 50 and generates sufficient friction and support force to tighten all the stators 50 from the inside, forcing the center of multiple stators 50 to coincide with the axis of the expansion sleeve 45, thereby providing an internal center reference. When the round assembly 20 presses from the outside in, all the stators 50 fit against this center reference. This allows the outer circumferential wall of the expansion sleeve 45 to fit tightly with the inner circumferential walls of the multiple stators 50, thereby positioning the center of the stator 50 so that the axes of the multiple stators 50 coincide with each other, thereby improving the roundness of the multiple stators 50 after they are rounded.

[0044] The working process of the circular assembly mechanism with center positioning is described in detail below: First, the robotic arm grips and places the multiple stators 50, which have been roughly assembled, on the positioning seat 35. The lead screw lifting device 31 drives and lowers the positioning seat 35 and the center positioning component 40, so that the multiple circular assemblies 20 and the multiple stators 50 are aligned with each other. Then, the multiple drive motors 21 drive and move the multiple circular blocks 28 to push and press the corresponding stators 50. When the pressure sensor 27 receives the pressure set value S1, the drive cylinder 41 drives and moves the pressure plate 46 to press the expansion sleeve 45, thereby expanding the expansion sleeve 45 so that the outer circumferential wall of the expansion sleeve 45 is in close contact with the inner circumferential wall of the multiple stators 50, thereby positioning the center of the multiple stators 50. When the pressure sensor 27 receives the pressure set value S2, the drive motor 21 stops driving and maintains the close contact between the circular blocks 28 and the stators 50. Then, the welding gun performs welding operations to weld and fix two adjacent stators 50 together. After the welding operation is completed, the drive motor 21 drives and moves the circular block 28 away from the stator 50. At the same time, the pressure sensor 27 receives the pressure set value S1, and the drive cylinder 41 drives and moves the pressure plate 46 away from the expansion sleeve 45. Thus, the expansion sleeve 45 returns to its original position under its own elastic force. Finally, the lead screw lifting device 31 drives and moves the positioning seat 35 to the initial position, so that the robot arm can grasp the multiple stators 50 after the circular operation is completed, and wait for the start of the next circular operation.

[0045] Compared with existing technologies, the rounding mechanism with center positioning provided by the present invention pushes and compresses multiple stators 50 through the rounding component 20, making them closely fit together to complete the rounding operation. The pressure plate 46 presses down on the expansion sleeve 45 to expand the expansion sleeve 45, so that the outer circumferential wall of the expansion sleeve 45 closely fits the inner circumferential wall of the multiple stators 50, thereby positioning the center of the stators 50 so that the axes of the multiple stators 50 coincide with each other, thereby improving the roundness of the multiple stators 50 after rounding. Moreover, the welding operation is carried out with the multiple stators 50 pressed between the inner and outer walls, which improves the stability of the welding operation and further improves the roundness of the multiple stators 50 after welding and fixing. The rounding mechanism with center positioning does not require manual intervention throughout the process, has a high degree of automation, and is suitable for assembly line production operations.

[0046] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions or improvements within the spirit of the present invention are covered within the scope of the claims of the present invention.

Claims

1. A circular assembly mechanism with central positioning, used for precisely assembling several stators that have undergone rough assembly, wherein the outer circumferential wall of the stator has a groove, and each end of the stator has a stepped portion, characterized in that: The center positioning mechanism comprises a workbench, a plurality of whole circle assemblies arranged on the workbench, a lifting assembly arranged on one side of the workbench, and a center positioning assembly arranged on the lifting assembly.

2. The centering whole circle mechanism according to claim 1, characterized in that: The length direction of the guide rail is the same as the length direction of the screw rod, and is towards the center position of the workbench.

3. The centering whole circle mechanism according to claim 1, characterized in that: The end of the push block away from the connecting block is fixedly provided with a whole circle block, and the end of the whole circle block away from the push block is protrusively provided with a positioning strip matched with the groove on the stator.

4. The centering whole circle mechanism according to claim 1, characterized in that: The lifting assembly comprises a screw rod lifting device, a lifting frame arranged on the output end of the screw rod lifting device, a connecting cylinder fixedly arranged on the lifting frame, a base fixedly arranged on the connecting cylinder, and a positioning seat fixedly arranged on the base.

5. The centering whole circle mechanism according to claim 4, characterized in that: The lifting frame comprises a first lifting plate arranged on the output end of the screw rod lifting device, at least four connecting columns fixedly arranged on the first lifting plate, and a second lifting plate fixedly arranged on the ends of the four connecting columns away from the first lifting plate.

6. The centering integral circle mechanism according to claim 4, characterized in that: The positioning seat is in a cylindrical shape, and a plurality of article placing tables are protrusively and separately arranged on the side of the positioning seat away from the base.

7. The centering and rounding mechanism with a central location according to claim 6, characterized in that: The end of the article placing table is provided with a welding groove, and a gap is arranged between every two adjacent article placing tables.

8. The centering integral circle mechanism of claim 1, wherein: The end of the push rod away from the connecting rod is provided with a pressing plate.

9. The centering integral circle mechanism according to claim 6, characterized in that: The protrusion of the expansion sleeve is in the plane of the article placing table of the positioning seat, and a circular hollow part is arranged between the positioning seat and the expansion core. The end of the push block away from the connecting block is fixedly provided with a whole circle block, and the end of the whole circle block away from the push block is protrusively provided with a positioning strip matched with the groove on the stator. The lifting assembly comprises a screw rod lifting device, a lifting frame arranged on the output end of the screw rod lifting device, a connecting cylinder fixedly arranged on the lifting frame, a base fixedly arranged on the connecting cylinder, and a positioning seat fixedly arranged on the base. The lifting frame comprises a first lifting plate arranged on the output end of the screw rod lifting device, at least four connecting columns fixedly arranged on the first lifting plate, and a second lifting plate fixedly arranged on the ends of the four connecting columns away from the first lifting plate. The positioning seat is in a cylindrical shape, and a plurality of article placing tables are protrusively and separately arranged on the side of the positioning seat away from the base. The end of the article placing table is provided with a welding groove, and a gap is arranged between every two adjacent article placing tables. The end of the push rod away from the connecting rod is provided with a pressing plate. The protrusion of the expansion sleeve is in the plane of the article placing table of the positioning seat, and a circular hollow part is arranged between the positioning seat and the expansion core.

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